OpenZeppelin is hiring a
Web3 Open Source Developer - Cairo

Compensation: $105k - $180k *

Location: Remote - Americas or EMEA

About us

Founded in 2015 with the mission to protect the open economy, OpenZeppelin is the world leader in securing blockchain applications and smart contracts.

Its bedrock open source Contract Libraries are a public good and industry standard for smart contract development.

OpenZeppelin’s professional expertise, unified with the Defender developer security platform, integrates through clients’ development lifecycles, so teams can plan, code, audit, deploy and operate projects faster and more safely.

Please note: Always refer to OpenZeppelin's official job page for the most accurate information about our open roles, as we have seen multiple third party job sites posting inaccurate information.

<h3><strong>Libraries and Tooling Team</strong></h3>

Join the team responsible for creating battle-tested libraries of smart contracts for Ethereum and other blockchains.

What you'll be doing

As a Open Source Developer, you will join our team that works on open source libraries for Cairo smart contracts, for use on Starknet. This library offers similar capabilities to those found in the widely adopted OpenZeppelin Contracts library. We are looking for developers who have experience in Cairo and are familiar with smart contracts written in Rust, Solidity, or other smart contract programming languages.

In this role, you will play an essential part in designing and implementing new library modules, communicating with smart contract developers and blockchain network community members to gather feedback, and working collaboratively with other members of the development team to make sure our open source library meets developer needs and expectations. You will be responsible for library coding, testing, documentation, and security. You may also participate in open source tools development to assist developers using our library.

You have

  • 5+ years of experience in software development.
  • 2 years of smart contract programming experience.
  • 1 year of Cairo programming experience.
  • Interested in or knowledgeable about Starknet and other Ethereum L1s and L2s.
  • Strong desire to further your education about and contribute to the blockchain space.
  • Prior experience working remotely: strong personal organizational skills, a love for self-time management, and ability to work collaboratively with a team.
  • Advanced English communication skills — all of our internal and external communication is in English.

Nice to have

  • Rust development experience.
  • Experience contributing to open source projects.
  • Good understanding of security concerns in the Ethereum ecosystem.


Our interview process takes place on Zoom and tends to consist of the following stages:

  • Recruiter Interview (30 mins)
  • Hiring Manager Interview (30 mins)
  • Team Interview (60 mins)
  • Paid work test (Lasting up to 10 days)
  • Reference checks


This is a 100% remote position with no travel required but we are only hiring in the following time zone range:

  • UTC -6 to UTC +2
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  • Company in-person gatherings in different locations around the world 😎
  • Fully remote work 🌎
  • Flexible time off 🏝
  • Paid parental leave for primary or second caregiver 💙
  • One time work-from-home equipment stipend of up to $500 USD 🪑
  • Co-working (up to $250/month) 👩‍💻
  • Medical coverage
  • Annual Learning & Development budget ðŸ§
  • Referral program
  • Work with a global team in a fast-growing industry 🚀

At OpenZeppelin, we are an equal opportunity employer and we value different perspectives. We are committed to building a diverse workforce. This includes but is not limited to gender, race, sexual orientation, religion, national origin and other characteristics that make each one of us unique. In this uniqueness, we find the most value. Come join us!

Apply Now:

Compensation: $105k - $180k *

Location: Remote - Americas or EMEA

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